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atatatatonce[英][ætwʌns][美][ætwʌns]adv.立即;一起;同时;立刻;immediately，马上，立刻。立刻immediatel

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at once[英][æt wʌns][美][æt wʌns]adv.立即; 一起; 同时; 立刻;

immediately，马上，立刻。

立刻 immediately ，right now

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